Kanpeki na Koushaku no Ayamachi

Abby was proposed to by the beautiful Duke Benedict, who was rumored to be the best groom in the world. She accepted in a dreamy mood, but ran away from the wedding when she found out he had a mistress. The whole of England criticized me for leaving the duke at the altar, and I can never hope to marry again. But that's okay. Three months later, Abby was traveling in a carriage when a storm hits, and she sought help at a nearby mansion, where it turned out Benedict, his mistress, and a gossipy socialite were staying... (Source: Renta!)